Thomas smith tait and john hood



(No Model.)

T. s. TAIT & J. HOOD.

PULP ENGINE.

No. 5-3z,494. Patent'ed'Jan. 15, 1895.

JJY-Bad aim/W4 flaw/w UNITE STATES PATENT OFFICE.

THOMAS SMITH TAIT AND J OHN HOOD, 'OF INVERURIE, SCOTLAND.

PULP-ENGINE.

SPECIFICATION forming part of Letters Patent No. 532,494, dated January15, 1895. PP filed February 8, 1894- Serial No. 499,551. (No model.)Patented in England December 15, 1892, No. 23,130

To all whom, it may concern.-

Be it known that we, THOMAS SMITH TAIT and JOHN HOOD, subjects of theQueen of Great Britain, and residents of Inverurie Mills, Inverurie,Aberdeenshire, North Britain, have invented new and useful ImprovementsConnected with Pulp-Engines, (patented in Great Britain, No. 23,130,dated December 15, 1892,) of which the following is a specification.

The object of this invention is in an engine provided with a guide orfence to guide or direct the pulp away from the back of the roll andprevent the pulp from being carried round with and over the top of theroll.

According to this invention a passage is formed at the back of the rolland so placed that the pulp is forced or thrown through this passageinto the trough of the engine and prevented from being carried roundwith the roll. In an engine constructed according to this invention thepassage through which the pulp is thrown into the trough may be formedat any point behind the bed plate.

In existing engines the passage may be formed by raising the back falland giving it a suitable shape by means of a block of wood, iron orcement fixing to the cover or sides of the engine a guide or doctorextending the whole width of the roll so as to form a passage of asuitable shape between the raised backfall and guide through which thepulp is thrown or directed away from the roll and into the trough of theengine.

The annexed drawings show our invention.

Figure 1,is a section on the line a, b, of Fig. 2, which is a plan ofthe beater engine, Fig. 3 being a part section indicating the protectionof the shaft by the guard.

A is the trough; B, the partition therein.

0 is the shaft and D the beater roll.

E is the shield with a curved guide F from which is hung by hinges aflap G.

H, is the uprisingincli-ne of the bottom to the bed plate I the bottomthen being curved at J to the neck K which is higher than the axle O ofthe beater roll D and from which neck is the descent plate or backfallL. This may be at any angle such as is indicated by full lines, thedotted line showing the height at which the backfall of an existingbeater engine is carried. The additional height can be i made to formthe narrow passage by building upon the existing one bya lump such asthat shown by the curved dotted line N.

M is the guard in the open return part of the trough Aand under theshaft 0.

The space between the top edge of the backfall L and of shield E andguide F is of such shape and narrow but of the full width of the rollDto prevent the stuff falling back between the roll D and curved plate Jor of being carried round by the roll D whereby the stuff hasa bettertravel and circulation than usual and passes ofte'ner and more regularlybetween the roll and plate.

By this invention the stud is more freely delivered behind the roll andstands higher in the trough than in ordinary beater engines and theguard not only protects the shaft but enables the stuff to moveuniformly along the return side of the trough.

What we claim, and desire to secureby Letters Patent of the UnitedStates of America, is-- 1. In pulp engines for paper making, thecombination with the trough, beater-roll and bed-plate, of a backfall,united therewith so as to form a continuous passage for the flow of pulpand comprising a curved portion J, forming the ascent plate and thedescent-plate L, connected therewith, the apex of which is located in aplane higher than the axis of the beater-roll, whereby the flow of pulpis accelerated, substantially as described.

2. In pulp engines for paper making, the combination with thebeater-roll D, of the trough A, having an upwardly inclined bottom H; abed-plate I, connected therewith; the curved portion J, communicatingwith said bed-plate and constituting the ascent of the backfall; thedescent-plate L, connecting said ascent plate with the trough; theshield E, extended over the beater-roll and provided with a guide F,said shield and guide forming in connection with the ascent-plate J andthe descent plate L a narrow neck located in a plane higher than theaxis of the beaterroll, whereby the flow of pulp is rendered more rapidand uniform substantially as set forth.

In witness whereof we have hereto signed our names, in the presence oftwo subscribing witnesses, this 3d day of January, 1894.

THOMAS SMITH TAIT.

JOHN HOOD. Witnesses:

WILLIAM Oowrn WIGHT, JAMES ROBB, Both of Invemr'ie JlLfiZZs, Invemrie.

